1. Global Health Program, Smithsonian's National Zoological Park and Conservation Biology Institute, Washington, DC 20008, USA
2. Rotterdam Zoo, PO Box 532 3000 AM Rotterdam, The Netherlands
3. Honolulu Zoo, Honolulu, HI 96815, USA
4. Zoo/Exotic Pathology Service, Carmichael, CA 95608, USA
5. Northwest ZooPath, Monroe, WA 98272, USA
6. Department of Veterinary Clinical Sciences, School of Veterinary Medicine, Louisiana State University, Baton Rouge, LA 70803, USA